Locomotive throttle-valve.



H. A. HUKL LOCOMTIVE THROTTLE VALVEv APPLICAUON flLED MAY 19, 1916.

Patented Miu'. 20, 1917.

2 SHEETS-SHEET 1- H. A. HOKE.

LOCOMUTIVE THROTLE VALVE.

APPLICATION FIL-'fa MAY"19.1915.'

Patented Mar. 20, 1917.

2 SHEETS--SHEET 2 HARRY A. HOKEOF ALTOONA, PENNE YLVAN'IA.

LoooMoTvE THEoTTLE-VALV E.

Specification of Letters Patent.

To all whom 'it may/nonoem:

Be it known that I. Hanny A. Home, a.

'citizen of the United States of America, and

a resident of Altoona, in the connty of. Blair and State of Pennsylvania, have 'invented a certain: new and useful Improvement in lJoeomotive ThrottleVali'es, of Whieh the following is a true and enact description, ref

erenee' being had to the aceompanying raw- -m ings, which form a part thereof.

My present invention relates to throttle valves especially devised for use on railway lmomotives, and particularly to throttle valves of the typey comprising a main throttle valveI and a balancing cylinder and relief or pilot valve to facilitate the opera-s tion. of the main," throttle valvef One o )jeet-y of my nventionis to provide a. simple and `eii'ective throttle valve ofthe type referred 20, to having. op 4 ed to be norme to and actuated in :the nsna'l manner" theordinary throttle lever arrangemei heretofore standard with: the ordina ry li'ieomotive' throttle valve 'not 'prov it wi'tha-a-baflalficing Cylinder and pilot 've'ie y i Another objmzt of my invention is to pro vide a. vulve of the type described. et suoli eonstrnetionthat thefnfovable valve parte may be 'withdigxwngfrotn the valve body for eleanixlg.y inspection; or repairs, with 3o-m paratii'fe ase and without requiring the valve body to berdetaehed from 'the steam pipe' to which4 itis` normally connected.

The various' features ofnovelty whieh chametei'jize my invention 4tire.pointed ont with `particu]arity in the claims annexed to and."

For 'a better understanding of the invention however', and the' advantages possessed by it,v

reference should be had to th accompanying drawings and descriptive matter inl which I "have illustrated and described a. preferred embodiment 'of my invention.

Of the drawings:

' Figure 1 is al side elevation partly in section of the throttle valve mechanism proper;

Fig. 2 is an end elevation of the mechanism shown in Figpl; l

Fig. i's'adiagf lmmatie plan of a portion ofa locomotive equipped with my improved throttle `v`valve mechanism Fig. 4 is an elevation of a detail of the throttle valve operating mechanism; -35 `Figs. 5, 6 and 7 are sections taken on the n means which are adapt` 'margin of the l' ort forming a part of this 'speoifieation ramena-oa Mar. 2o, 1917.

Application filed May 19, 1916. Serial N0. 18,507.

lines 5-5, 6--6, and THT respectively of Fig. 4f; and

Fig. 8 is a' i iew taken, similarly to Fig. l showing a portion ot' al slightly modified Construction.

.lfn the draw .nge A represents the throttle valve easing or body proper which is open at itsupper ei' d and is formed at its lower` end vith an elbow like portion clamped in the usual man1 er to the end of the dry pipe AW o :lf the loco motive. The casing or valve body A is formed with an'internal horizontal web or flange A .located somewhat below the upper end of the valve body and having a central opening or port A2 throngh it. Fitting in the opening A2is a removable valve seat ring or annular member B which, shown, has an ont-turned flange atits Upper end seatfd against the web A at the. A?. The valve seat ring held against displacement by the stud bolts B which are tapped into thel web A, and-the heads of which! extend over the up per edge of the valve seat ring B. In the ocnistrnetinm,shawn in 1, a slight clean anne provided, between the periphery of the member Hand the surrounding Wall of the n'el'i A, y member B and the heads of the bolts B. This permits the member B a limited'caf "y for seliadjustnient. Where this oa.` parity is not .needed or desired the seat mem-1 y lier B may fit singly in its seat as shown in Fig. 8. In this ease the upper edge of the valve seat ring B maybe slightly above the upper surfaefy of' the web A" so that the valve 4seat ring B aganstits seatly throttle valve C edge against the upper end of the valve seat the bolts B. .The main ard between the top of the l may he rigidly clamped ring-B and is formed With a central passage C. and with a vz lve seat at the upper-mar.- gin of this passage aTga-inst Which `the vvalve seat engaging shoulder D of a pilot valve D is adapted to hear in the closed position of the valve.

VVithjn the valve web .A isV located a pressure equalizing cylinder A3, which is open at its upper endand elosed at its lower end and integrally connected to the outer shell of the valve boi'iy als by the Webs A4. The cylinder A? body and beneath the'V I ,which is 1 coaxial with the p ort A2 has an internal dia'meter slightlysm aller than the diameter oi` the portv A2 prop'e1',.and slightlylarger thanI through the y bodyI at-its upper the internal diameterof the valve seat ring' B. Working in the cylinder A is a piston E formed as shown,v on its upper side with a hollow open ended boss E whicli'has a telescopic connection with a hollow boss C" depending from the underside of the main valve C and. surrounding the lower portieri of the passa-ge C. The pilot valve D has a depending stem portion passing downward passage C and through the hollow boss E and carrying at its lower end a nut D2 adapted to engage a hub or spider portion E of the valve member E in which the lower end of the stem of the pilot valve is guided. A small port E2 through the pisto'n E establishes a restricted communication between the lower end of the cylinder A and the surrounding portion of the outlet chainber of the throttle valve casing or dry pipe on'the outlet side of the port A2.

lVth the construction described, in the closed position of the throttle valve mechanism described, the main valve C seats against the valve seat ring B and the valve seat engaging 'portion D ofthe pilot valve seats snugly against thes'eatprovided at the upper margin of the passage C, and the main and pilot valves "are held firmly against their seats by the steam pressure above them.

The main valve is operated through the pilot valve D. The initial upward opening movement of the vpilot valve D opens the upper end of the passage' Cg and-permits the inlet pressure to pass itortheiloi .er end the chamber A3 through thelitjillow boss E of the piston E. This brings about the slight initial upward movement of the pis ton E necessary to bring the latter into engagement with a shoulder formed for the purpose on the main valve C, whereupon the downward pressure of the steam on the upper side of the valve C is substantially balanced, orl slightly overbalanced, by the upward pressure -V acting on the under side ofthe piston In consequence the main valve C rnay be manipulated with comparative ease.

-The means which I havedevised for raising and loweringthe pilot valve D and hence the main valve C, comprisesa rocking orcrank element G joiirnaled on the valve end, s shown, the crank or rocking element G'i's in the form of a rock shaft extending across the open upper end of the valve body and journaled in split bearings A rovided at the upper end of the valve bo y, The rockl shaft G is provided with a central arm G2, the free end of which-is'connected by the pivot pin G to the upper end of a link F which is connected at its lower'end by the pivot pin D* to the pilot valve D, and extends in approximate alinement with the latter. At its ends the rock shaft G. is provided with arms` Ga 'which are located 4atmopposite sides of the and .is done, the rocking shaft G,

valve body and are-connected, as by the readily removable pivotpins G, to thc upper ends of depending links ll. The latter'are connected by pivot pins Jo to the arms J" of a rocking element J `which is pivotally connected to the valve body.

As shown, the rocking element J is .formed with pockets J2 open at one side to receive bracket ears A carried by the valve casing .A and apertured to receive the bolt I on which the rocking element J is jcurnalcd` To facilitate the formation of the element .l by casting, the latter is AFormed with a cen tra] passage which loosely receives the bolt l, and is open at one side Yfor most of its length asis shown by the drawings. This permits the ready removal of the core material. This central passage is restricted at the side walls of the pockets J2 to forni cylindrical bearings, which may be roamed or bored out, for the bolt I. The n'ieiuber J is formed at its center with a crank arm J pivotally connected to the valve operating rod K` rlhe latter passe-s through, a stuiiing box K in the rear end wall of the loco-- motive boiler shell L and externally of the latter ifs connected to theusual throttle lever M, as shown diagrammatically in Fig. 3.

The construction described thus permitsof a simple and effective (una-ating connection hetween-athrottle lever of the usual typeI and mounted in the usual location, and a throttle valve of the special balancing cylin der and pilot valve type shown. The character of the operating connections provided for the pilot and hence themain valve, permit of a convenient and satisfactory construction of the internal portions of the throttle valve mechanism proper. The location oit the main valve seat at a distance be low the upper end of the valve body where the upper rocking element G is journaled, minimizes the tendency of the main valve and attached balancing piston to cock and jam in its guideway.

The throttle valve mechanism proper .is easily taken apart fior inspection, adjustment or repairs. This may be conveniently and readily accomplished without discon`I nec'tingthe'valve body Afrom the steam pipe A10 when the cover LL for the steam dome lL is removed by' proceeding inthe `following manner: First the valve C is moved to the wide open position and then the pivot pins G* are removed. To facilitate the removal of the latter the upper edge y of the valve bod A may be notched as indicated at A". A ter the rock shaft G is disconnected rom the links H, the capsof the splitvbearings A5 are unbolted and removed,

the bolts B are taken out. 'YVheu this" valves C and l), piston Epmd valve seat ring Ema-y all be drawn together away from the valve body A and out of the locomotive boiler shell v ot i,

per and. and

` anis'm can thus be taken apart is of consid erable practical importance, especially as 5 this operation frequently has to be performed While the locomotive is hot and. Smnetiluee 'where ordinary machine Shop fa i eilities are not available.

The location of the rocking elementyJ at lo the lower end of the valve body iiern'iite the operating rod l( to be loeated well below the boiler shell while at `the Same time the throtM a tie "valve body is 'lgieimitted to extend well.`

to the ram dome L of the locomotive, t ioi't eontrolled by the valve (j may near the opper end of the valve he throttle valve operatinv ii anieiu oli re a minimum of obstine lon also on and repair of the interior hieonnjitive boiler tliroifigh the Steam dome L when the cover L2 is removed Since neither ythe rook Shafts (if and J, nor the y linke lil extend into the Space between the vrear of the valve body A andthe adjacent le wall of the steam dome L.

hile in ruil'eordanee with the previsione of the etatutee l have illustrated and de- A t forni of my invention now l it will be apparent to those art that changes can be made in of my invention 'without depart '1 Spirit, and thatfeome features :dition canl be used 'without a correa oli" otl teatures.m l w described my inventi i'inwhat .,.ew and desire to eeeuiie by Let-- it lo(l iiiiotive throttle valve eomljirieing' 'n tion a valve body open ite upprovided` with an int i'nal. portl alve Seat below Said up er end, a valve imiva'lil-e toward and away from said seat to control. said, port andoperating` means :for

l valve bodyabove the valve seat made parable to permit the element to be lifted. ud away :trtirm Said valve body, a lower ,ing el ent external to said valve body l pivot y connected to the latter adjat the liiweii e'nd of the valve body, links l to the valve body connecting said elemente, andan olgierating eonnee ie lower rocking element. ln a loeomotive, the combination with the lmiler shell of a throttle valve/located in ,i l il all and comprising a valve body open at ite upper end and provided with an in tei ial. ported valve Seat belofw said upper end, a valve imrvable toward and away from eiiintrol said `port and operating l,d valve mounted on said i'falve and eomprising au upper if'oeliing' eier i, means for journaling said element on .l valve body allieve the valveeeat made y il valve comprising an upper rocking ele.` 45 nient, means tor )ournaling said element on `sepiarable to permit-the element to be lifted up and away from said` 'valve body, a lower rocking element external to said valve body and pivotally eonneute'd to the latter adjacent the lower end of the valve body, links exteri'ial to the valve body' connecting said rocking,m elemente, and an operating rod connected to the lower melting element and projeetiiiag,i through the rear end 'wall of Said shell. y

A. loeoinotive throttle valve Comprising in roii'ibination a valve body open at jits up- ]ier end and provided `with. an internal ported valve below Said upper end and a balancing; cylinder lo :ated in the valve body below Said seat, a n'i ain valve movable toward and away from `said seat to control said port, a balaneiig piston working rin said Cylinder, a pilot valve mounted in said nuiin valve with .freeloi'u for liniitedmove ment relativ` Sto the latter and 'Controlling eoi'nuiunieation'with i he interior of said oylinder below the balancing piston and valve operatingl means com prising a rocking element pivotally connected to said pilot'valve, means :tor journaling' said element on said valve body above th( valve seat made Separable to permit the element to be lifted up and away from said val ve body, and means external to and pivoi ally connected to said valv body adjacentv the lower end. of the lat i' :tor o. :illa'ting said. rocking element.

A loeoinotive tlrottle valve ooniprisf in combination a valve body open at its ingr r end and prov.` ded with an internal eeparable to permit tl Le element to be lifted up and away from said valve body, a second rook shaft journiled in said ears and extending beneath the valve body, links at the sides of the valve body connecting said rook Shafts andan operating rod pivotally connected -to the lower rock Shaft.-

5. A loeomotive throttle valve comprising in combination a valve body Open at its upper' end andv form ad internally withy a seat ioi" a valve seal member i below Said upper end and beneath said seat with a half, -aneing cylinder and provided at its upper end with separable Shaft bearings, a removable annular valve seat member mounted in eaid Seat, a main valve for controlling the yuieeage through said annular Seat Ineniber and a balancing piston working in said oylinder and of a diameter greater than the inteiiiial oit I in l nit min valve fof; controlling commuported valve seat lbeltvv said upper end andv l. said cylindery below the bal-` and lese than the external diameter l. seat member, z. pilot valve mounted ancing piston, said piston und mainy and pilot,

bearings and extending across the valve body and a connection between said pilot valve and rock shaft.

G. In a locomotive, the combination with the boiler shell provided with a steam dome and a. removable cap for the latter, of a throttle valve comprising a valve body projecting up into the steam dome and open at its upper end and formed internally with a seat for a valve seat member below said upper end ad beneath said seat with abaiancing cylinder, a. removable annular valve seat member mounted in said seat, a main valve for controlling the passage through said annular seat member, a balancing piston working in said cylinder and of a diameter. greater than the internal and less than y the external diameter of said Seat member,

la. pilot valve mounted in said mainA valve for controllii communication vwith :said cylinder below` the balancing piston, said piston -and main and pilot valves being connected' together With 'freedom for a limited relative movement of the two valves, a rock shaft extending across the valve body above said seat and meanswfor journaling said shaft on said valve body made separable to permit Athe shaft to be lifted up and away from said valve body, a connection between said l .pilot valve and rock shaft, and actuating having its center in frontl ot' the center ot the steam dome, and being open at its upper end and provided with an internal ported valveseat belovT said upper end and lwith a balancing cylinder located in the valve body below said Seat; a mainvalvc member moving toward and aivay from saidseat to control the port in the seat and comprising a balancing piston Working in said cylinder, a pilot valve mounted in said main valve with freedom for limited movement relative to the latter and controlling communication with said chamber and valve operating means comprising a' rocking element'piy'otally connected tosaid'valve body at its upper end and a link connection between said rocking element and pilot valve, a second rocking element pivotally connected to the valve body with its axis below the valveseat, means 4external to the valve'body and located at the sides of the latter pivotall-y connecting said rocking elements, and an operating rod connected to Said second roel;- ing element and projecting through the rear end Wall'of said shell.

HARRY At HQKE.L 

